Exodus 14:4-5

4Then I will cause Pharaoh's mind to become hard again. He will go to catch the Israelites. I will show how great I am when I win against Pharaoh and his whole army. Because of this, the Egyptians will know that I am the Lord.’ The Israelites did what God said.

5Someone told the king of Egypt that the Israelites had run away. Then Pharaoh and his officers changed their minds about the Israelites. They said, ‘We have done a foolish thing. We have let the Israelites go. We have lost our slaves!’